Door-check.



CLARENCE T. ROGERS, OF NEW YORK, N.

Doon-CHECK.

Specification of Letters Patent.

Patented Mar. 24, .1914.-

y Application led Hay 28, 1913. Serial No. 776,526.

' door checks, and the object of my invention is to produce a very simple and eiiicient form of door check which can be conveniently attached to a door and frame in such a manner that the main portion of the check is hidden from View, and which is arranged y so` as to operate positively andwith little danger of getting out of order.

Reference is to be had to the accompanying drawings forming a part of this specification, in which similar reference characters indicate corresponding parts in all the views.

Figure 1 is a vertical section of the door check as applied to a door and frame, the door and frame being broken; Fig. 2 is a fragmentary plan view of the check and a portion of the door, Fig. 3 is a detail inverted plan of the piston which forms a part of thecheck, and Fig. 4 is a detail sectional view on an enlarged scale showing the lower end of the valve plug.

The invention is provided with a casing or well 10 which is preferably arranged in a vertical manner as hereinafter more particularly described, and this casin contains a vertically movable piston or p unger 11 which has a limited guided movement longitudinally of the casing, this movement being best regulated and guided by means of set screws 12, or equivalent abutments which extend inward from the casing wall and enter slots or key ways 13 in the outer wall of the piston. The piston is hollow, and is cut off obliquely at the top as shown at 14, so as to give it a cam surface at its upper edge. The piston is normally pressed outward and upward by the spiral spring 15 which is arranged behind it. In the bottom of the piston is a hole 16 through which the oil or other liquid used -in the check passes 'downward when the piston is raised, and

this hole is closed at the bottom by a light fiat spring valve 17 which is fastened to the piston as shown at 18, and which has a small hole 19 through the center alining with the hole 20 in the bottom of the piston 11. The hole 20 is preferably screw threaded to receive the threaded lower end of the valve plug 21 which is notched at the top as shown at 22 so that a screw-driver canA be conveniently used to adjust the valve -in the threaded hole 20. The valve plug 21 has a Hattened bevel portion 21' extending from the point to alittle above the' conical part of the plug, as shown in Fig. 4, so that by screwing the plug up or down, the How of liquid can be regulated as more or less will pass, according to the position of the bevel portion 21a 1n the bottom of the piston 11. This can be done by inserting a screw-driver through the hole 23 in the block 24 which is arranged at .the top of the casing 10, and is fast to the splder 26, the latter being integral with the cam 25 which is arranged Within the casing l0 above the piston 11, the cam being hollow and having its lower edge cut obliquely but oppositely to the upper edge 14 of the piston 11. i

It will be seen that when the cam 25 is rotated so as to bring the highest point of the cam opposite the highest part of the cam surface 14 of the piston, the piston will be depressed; but when the cam 25 is turned so that its highest point moves away from the highest point of the piston, the latter will be permitted to rise under the impulse of the spring 15. A liquid such as glycerin, oil, or other suitable liquid, is used in the check, and it will be observed that when the piston is raised, the oil will iiow down through the hole 16, and the spring valve 17 is light enough to permit this action; but when the piston is forced down, the liquid will flow up through the hole 19 in the valve and the hole 20 in the piston, this flow being regulated by the valve plug 21 which can be adjusted as above described.

The cam 25 is prevented from rising by a collar 26a against which the spider 26 abuts, and the parts are allvfurther` held in place by a keeper-plate 27 which is fastened to the top of the door 34, hereinafter referred to, as shown at 28. The collar 26a is fastened to the vtop of the casing 10 by screws or otherwise, as shown at 26b in Fig. 1. A block 24 is fast to the spider 26 and cam 25, and rotates in the keeper-plate 27, but the tcp of the block is squared as shown at 24a in Fig. 2, and is connected with one arm 29 of a pair of arms which open and close like scissors, and which when the door is closed, lie flat over the top of the door. The second arm 30 of this pair is pivoted to the .first arm 29 as shown at 31, and is secured to the door frame 33 as shown clearly at 32 in Fig. 1. The

` casing is let into the top of the door and tated so as to force down the piston 11 against the tension of the spring 15, and the liquid has to pass up through the holes 19 and 20 and over the flattened part 21a of the valve plug 21, so that the amount of retardation will dependlargely on the adjustment of the valve plug. It will be seen, therefore, that the amount of retardation can be nicely regulated, and it will be observed that there is very little about the apparatus to be seen and that the ope-ration is positive and etlicient. v

I claim 1. The combination with a door and its frame, of a door check sunk in the top edge of the door, a pair of arms folding one over the other and adapted to lie parallel upon the door top, an Voperative connection between one of the arms and the door check,

whereby the swinging of the arm operates the check, and a connection between the second arm and the door frame.

2. The combination with a door and its frame, of a stationary casing sunk in the top end of the door, a piston having a guided longitudinal movement in the casing, means frame of the door.

, 3. -The combination with a door and its frame, of astationary casing sunk in the top edge of the door, a 4spring pressed piston held in the casing, valve mechanism to control the passage of liquid through the piston, a rotatable cam arranged in the casing above and acting against the piston, a projection on the cam, an arm secured to the projection and adapted to lie upon the door top, and a second arm pivoted to the iirst arm and also securedI to the door frame.

vCLARENCE T. ROGERS. Witnesses:

WARREN B. HUTGHINSON, ARTHUR G. DANNELL. 

